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Architecture Decision Record

An architectural decision record (ADR) is a document that describes an important decision with its context and consequences.

Lightweight Architecture Decision Records was rated in ADOPT part of the Technology Radar by Thoughworks in november 2017.

What is ADR ?

An architectural decision record (ADR) is a document that describes an important decision with its context and consequences.

An architectural decision is a design choice realized in a product to respect a requirement.

A Requirement is a constraint element that affect a product with measurable effect.

The decision log groups all ADRs for a particular product.

This project will help you in this practice with somme guidelines to log all of your architecture decision and with a template of ADR.

How to start decision log

Nothing more simple, just create a directory ADR at the root of your project.

Then for each decision, it will be enough to create a file that will inform what the decision is and then commit it.

Naming convention

We will use a simple naming convention.

The naming convention:

Prefix with the date AAAAMMJJ.
Short name of the decision.
Use Markdown extension.

Examples :

20180102_Choose_js_framework.md
20180210_Choose_graph_database.md
20180601_Replace_js_framework.md

Content

An Architecture Decision must respect this follwing practices :

  • Dated. When the decision was taken.
  • Rationnal. Explain why the decision was taken.
  • Immuable. The content should not be altered.
  • Unique. Only one decision by record.

The context should be explain. Explain why decision was taken :

  • Business priority.
  • Organisation.
  • Skills.

The consequences must be measurables :

  • Right approach. The decision is pertinent and will be stable in time.
  • Wrong approach under constraint. Explain what will be arrived and what is under survey.

An Architecture Decision can remplace an older :

  • Identify replaced ADR and log it in the new.

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